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Commitc9d502e

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Update guidance for running vacuumdb after pg_upgrade.
Now that pg_upgrade can carry over most optimizer statistics, weshould recommend using vacuumdb's new --missing-stats-only optionto only analyze relations that are missing statistics.Reviewed-by: John Naylor <johncnaylorls@gmail.com>Discussion:https://postgr.es/m/Z5O1bpcwDrMgyrYy%40nathan
1 parentedba754 commitc9d502e

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‎doc/src/sgml/ref/pgupgrade.sgml

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@@ -807,10 +807,11 @@ psql --username=postgres --file=script.sql postgres
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</para>
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<para>
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Using <command>vacuumdb --all --analyze-only</command> can efficiently
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generate such statistics, and the use of <option>--jobs</option>
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can speed it up. Option <option>--analyze-in-stages</option>
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can be used to generate minimal statistics quickly.
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Using <command>vacuumdb --all --analyze-only --missing-stats-only</command>
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can efficiently generate such statistics. Alternatively,
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<command>vacuumdb --all --analyze-in-stages --missing-stats-only</command>
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can be used to generate minimal statistics quickly. For either command,
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the use of <option>--jobs</option> can speed it up.
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If <varname>vacuum_cost_delay</varname> is set to a non-zero
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value, this can be overridden to speed up statistics generation
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using <envar>PGOPTIONS</envar>, e.g., <literal>PGOPTIONS='-c

‎src/bin/pg_upgrade/check.c

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@@ -781,7 +781,7 @@ output_completion_banner(char *deletion_script_file_name)
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pg_log(PG_REPORT,
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"Some optimizer statistics may not have been transferred by pg_upgrade.\n"
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"Once you start the new server, consider running:\n"
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" %s/vacuumdb %s--all --analyze-in-stages",new_cluster.bindir,user_specification.data);
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" %s/vacuumdb %s--all --analyze-in-stages --missing-stats-only",new_cluster.bindir,user_specification.data);
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if (deletion_script_file_name)
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pg_log(PG_REPORT,

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